Render a smooth polygon mesh using Smooth Mesh
Preview
You
can set up a smooth preview in the 3D viewport and then render it.
In
the Render Settings window, under Render
Using, select mental ray.
Select
the polyShape node for your mesh.
In
the Attribute Editor, expand the Smooth
Mesh section and select Smooth Mesh Preview.
Select
the level of smoothing for your mesh by tweaking the division level. A
higher value produces more smoothing. If you want to use the same division
level for the 3D viewport preview as for your render, select the Use
Preview Level for Rendering option. Otherwise, uncheck
the Use Preview Level for Rendering option
and use the Render Division Levels slider or
text field to enter the desired division level for your render.
NoteTo obtain smooth render effects, you must
ensure that the Export Triangulated Polygons option
in the
Options tab,
under the Translation section and Performance sub-section,
is enabled.